Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 7458421 | Methods and systems for robust and accurate determination of wireline depth in a borehole | Harry Barrow, Ashley Bernard Johnson, Michael Paul Barrett, Charles Jenkins, Gary L. Rytlewski | 2008-12-02 | $37,990,000 |
| 7455104 | Expandable elements | Mark C. Duhon, Simon L. Farrant, Manish Kothari | 2008-11-25 | $70,971,000 |
| 6588508 | Method and apparatus to reduce trapped pressure in a downhole tool | Robert A. Parrott, Haoming Li, Anthony P. Vovers, Cynthia L. Hickson, Harry B. Anderson | 2003-07-08 | $50,037,000 |